Question

Calculate the pH at the equivalence point in titrating 0.047 M solutions of each of the following with 0.019 M NaOH.




(a) hydrochloric acid (HCl)

pH =  



(b) boric acid (H₃BO₃), K_a = 5.8e-10

pH =  



(c) arsenous acid (H₃AsO₃), K_a = 5.1e-10

pH =  

Answer 1

In boric acid and Arsenous acid first step is neutralisation reaction and second reaction is hydrolysis by their conjugate bases .